HREELS study on the effect of iodine on the bonding of CO on Rh(111)

• Published in: Surface science Vol. 420; no. 1; pp. 17 - 24
• Main Authors: Klivényi, G., Solymosi, F.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 11-01-1999; Amsterdam Elsevier Science; New York, NY
• Subjects: Adatoms; Carbon monoxide; Catalysis; Condensed matter: structure, mechanical and thermal properties; Electron energy loss spectroscopy (EELS); Exact sciences and technology; Iodine; Low index single crystal surfaces; Physics; Rhodium; Solid surfaces and solid-solid interfaces; Surface structure and topography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thermal desorption spectroscopy; Vibrations of adsorbed molecules; Rhodium; Vibrations of adsorbed molecules; Low index single crystal surfaces; Thermal desorption spectroscopy; Adatoms; Carbon monoxide; Catalysis; Electron energy loss spectroscopy (EELS); Iodine; TDS; Inorganic compounds; Infrared spectra; Lattice vibrations; Coverage rate; Experimental study; Preadsorption; Surface structure; Reflection spectrum; EEL spectroscopy; Transition elements; Adsorption structure; Absorption spectra
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/S0039-6028(98)00791-2

The adsorption of CO on I-covered Rh(111) surface has been investigated by TDS and HREELS. Adsorbed iodine was produced by decomposition of adsorbed CH
3I. The uptake of CO significantly decreased in the presence of I adlayer. At high I coverage (
Θ
I=0.33) the maximum amount of CO adsorbed was only one third of that measured for clean Rh(111). Preadsorbed I lowered the stability of adsorbed CO. HREELS measurements revealed that the I adlayer reduced the intensity of the vibration loss for the on-top bonded CO and caused a new loss feature at 1700–1800
cm
−1 due to the bridge-bonded CO. At ambient CO pressure, a high frequency CO peak was detected by RAIRS, which was attributed to a short range CO–I interaction.